Fixed bounding issue in SimpleMessageStore and introduced UpperBound to avoid code duplication with PriorityChannel

org.springframework.integration/src/test/java/org/springframework/integration/store/SimpleMessageStoreTest.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2002-2010 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.integration.store;
+
+import org.junit.Test;
+import org.springframework.integration.core.Message;
+import org.springframework.integration.core.MessagingException;
+import org.springframework.integration.message.MessageBuilder;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author Iwein Fuld
+ */
+public class SimpleMessageStoreTest {
+
+	@Test
+	public void shouldRetainMessage() {
+		SimpleMessageStore store = new SimpleMessageStore();
+		Message<String> testMessage1 = MessageBuilder.withPayload("foo").build();
+		store.put(testMessage1);
+		assertThat((Message<String>) store.get(testMessage1.getHeaders().getId()), is(testMessage1));
+	}
+
+	@Test(expected = MessagingException.class)
+	public void shouldNotHoldMoreThanCapacity() {
+		SimpleMessageStore store = new SimpleMessageStore(1);
+		Message<String> testMessage1 = MessageBuilder.withPayload("foo").build();
+		Message<String> testMessage2 = MessageBuilder.withPayload("bar").build();
+		store.put(testMessage1);
+		store.put(testMessage2);
+	}
+
+	@Test
+	public void shouldHoldCapacityExactly() {
+		SimpleMessageStore store = new SimpleMessageStore(2);
+		Message<String> testMessage1 = MessageBuilder.withPayload("foo").build();
+		Message<String> testMessage2 = MessageBuilder.withPayload("bar").build();
+		store.put(testMessage1);
+		store.put(testMessage2);
+	}
+}